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https://issues.apache.org/jira/browse/LOG4NET-290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13627644#comment-13627644
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Pavel Nedoma commented on LOG4NET-290:
--------------------------------------
Since I wasn't able to find any conclusion on this topic I would like "reopen"
this issue. I'm using log4net in many oh my projects and quite a few of them
have the need to write to log objects, whose ToString is not very cheap. To
avoid unnecessary calls for configurations that have logging disabled I use
lazy evaluation of ToString that depends on the fact whether the related log
level is enabled or not. Instead of using if-logenabled-blocks everywhere where
is such object logged I prefer more elegant way with a lambda function (e.g.
Log.Debug(()=>hugeInstance.ToString());) So far I have a class with extension
methods to have logging methods with a delegate in parameters, But I think that
this feature could be useful for many log4net users and therefore ILog could be
extended to support such signatures.
Here is a draft (no doc comments and I think that it could be nice to also have
the (delegate, exception) overload) of my solution
https://gist.github.com/anonymous/783045423b1c26011ac3
> Add Lambda-based ILog-Extensions (embedded log.IsEnabled)
> ---------------------------------------------------------
>
> Key: LOG4NET-290
> URL: https://issues.apache.org/jira/browse/LOG4NET-290
> Project: Log4net
> Issue Type: New Feature
> Components: Core
> Affects Versions: 1.2.10
> Reporter: Lars Corneliussen
> Fix For: 3.5
>
>
> This statement:
> if (log.IsDebugEnabled) log.DebugFormat("x: {0}", 123)
> Could be nicely shortened to:
> log.Debug( m=>m("value= {0}", obj.Value) );
> I'm already apache committer (NPanday Incubator Project) and would be happy
> to help with this interface. The simplest thing would be to offer it as
> static Extension-Methods to ILog.
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